Connection failure when trying to upload data to azure with bcp

Debugging 3.3.8 I finally found out, why my Data uploads to azure fail when using SQLAzureMW.

Here's the explanation: When connecting to the target (=azure) SQL-Server I omit the @servername when entering my username because SQLAzureMW will ask me and add it itself.

When building the bcp arguments in TargetProcessor.BCPUploadData (Line 128) you get -U myusername (but without @servername) which won't work with bcp.

SQLState = 37000, NativeError = 40531
Error = [Microsoft][SQL Server Native Client 10.0][SQL Server]Server name cannot be determined. It must appear as the first segment of the server's dns name (servername.database.windows.net). Some libraries do not send the server name, in which case the
server name must be included as part of the user name (username@servername). In addition, if both formats are used, the server names must match.

The reason for this is in ServerConnect.ConnectCommandButton_Click (Line 178). There you add @servername to the dialog's textbox but not to the _ServerConn.Login property!

This seems to work when connecting through Microsoft.SqlServer.Management.Common.ServerConnection but not on the commandline using bcp.exe which uses SQL Server Native Client.

I think you had a regession in 3.4 as I had to manually add my SQL Azure Database server name to my login to get it to work correctly. if I didn't enter my name as {username}@{sqlazureservername}
it would not work